Telescope



Sept. 1'3, 1938.

' A. LAN'GsNER1 TELESGOP r Filed Feb.l 1, 1935 ITUUenoT: CI/ziOQpULQQQSll/r @v @we 6MM-w@ ...NLE ,Q1

shiftable focusing means, the co-operating parts telescope, suitable manually operable means, serving also to cover and conceal the means for shown as a knob 43 mounted externally on the adjusting the eyepiece axis and prevent entrance barrel, being provided for moving the objective of foreign matter at said axis adjusting means. slide.

Another important object is to provide an im- The barrel of the telescope majhif desired, be 5 proved eyepiece construction for telescopes incarried in a mounting 0r SllppOrt Comprising, irl cluding an adjustable reticle mounted as an intethe illustrated embodiment, an. annular collar 25 gral part of the eyepiece assembly, whereby the snugly fitted to and embracing the outer surfaces eyepiece and reticle may be mounted in the teleof the barrel. This Cellar may, as shown, be

scope as a unit. Y formed with means such as the arms 2l for 0 Another important object is to provide a telemounting the telescope in a support Such as the scope having an eyepiece construction embodying frame 0f a transit, fOr exemple. The barrel an adjustable reticle including' cover means mounting collar 25, in the illustrated embodiadapted for mounting in the telescope in position ment, serves also as a support for the objective to enclose the eyepiece in dust-proof manner, said Slide adjusting means but I `d0 IlOt herein Claim 3-5 cover means being readily removable to expose the novel features of the barrel suppOIt and 0f the reticle adjusting means and, when in closed the Objective slide adjusting means, neither sepposition, serving to protect the telescope against arately ilOI in COmbinatiOn, silice the same form the entrance of foreign matter through said adthe subject-matter claimed in my copending di- 40 justing means. l visional application for United States Letters 40 Numerous other objects and advantages of the Patent for Telescope, Serial No. 181,678, filed invention will be apparent from the. following de- Dec. 24, 1937. scription, which, taken in connection with the Ihavehowever, provided animDro-ved eyepiece accompanying drawing, discloses a, preferred cmconstruction for use in sighting devices, such as bodiment of the invention. telescopes, which eyepiece may conveniently be N Referring to the drawing: arranged as an assembly on a frame 65, prefera Figure 1 is an elevational Viewv 0f a, telescope ably fOImed, 34S at 61, OI' attachment in the eyeembodying my present invention, parts of the depiece end 0f the telesCOpe barrel. vice being shown in section to reveal the details The eyepiece assembly shOWn t0 demonstrate cf Construction; v my present invention comprises an adjustable 5 Figure 2 is an elevational View of the device cross hair reticle 6| and adjustable means 63 for viewed from the right-hand end of the instrufocusing' the eyepiece llpim the Cross hairs of the ment as shown in Figure 1; and reticle, the reticle and focusing means being ar- Figure 3 is a section on line 3 3 in Figure 1. ranged as a unit for assembly in the telescope Patented Sept. 13, 1938 Y UNITED STATES PATENT OFFICE TELESCOPE Adolph Langsner, Chicago, Ill., assignor to Eugene Dietzgen Company, Chicago, Ill., a corporation of Delaware Application February 1, 1935, Serial No. 4,433

8 Claims. (Cl. 88-32) My invention relates in general to telescopes drawing, a telescope Il, more especially adapted and has more particular reference to telescopes for use in a transit, although the features of my for use in surveying instruments, such as levels, present invention may, with equal facility, be aptransits, and the like. plied in telescopes for use in other instruments,

1.1 An important Objectis to provide an improved including levels and a'lidades, and in telescopes 5 dustproof focusing' eyepiece construction for a telgenerally regardless of special use, scope or purescope, the eyepiece construction being adapted pose, as will become apparent as the description for adjustment from outside of the barrel of the proceeds.

telescope while preventing entrance of dust and. The telescope, as shown in the accompanying mi other foreign matter. drawing, may comprise a tubular barrel prefer- 10 Another important object is to provide an imably of cylindrical configuration, which is or may proved eyepiece construction for telescopes be belled or enlarged at one end, as at I3, to rewherein the eyepiece has manually operable foceive an objective lens assembly I5. The telecusing means accessible from outside of the telescope barrel, at the end opposite the objective 15 scope and also adjusting means for positioning lens assembly, is fitted with an eyepiece assembly 15v the axis of the eyepiece in alignment Within the Il and the barrel may carry an objective Slide I9 telescope barrel, including the provision of co-optherein between the eyepiece and lens assemblies erating eyepiece parts adapted to seal the same I5 and l1. This objective slide I9 preferably caragainst the entrance of dust and other foreign ries the usual focusing lens 2| and is movable matter into the eyepiece between the relatively within the barrel for the purpose of focusing the 20 To illustrate my invention, I have shown on the and including cooperating parts adapted to ex- ,55

clude foreign matter from entering the. eyep-iece as Well as the barrel of the telescope.

To this end the portion 61 may be threaded, welded, or otherwise secured in any suitable or convenient fashion to the barrel of the telescope. The remaining portions of the frame 65 project outwardly of the end of the barrel in position to support the reticle 6| and the focusing means 63, said outwardly projecting portions having an overall or external dimension substantially less than the overall dimension of the telescope barrel. The eyepiece reticle 6| comprises a cross hair support adapted to be mounted within the frame 65 adjacent the portion 61 by means of adjusting screws 69 threaded into the reticle and having heads extending outwardly of and bearing on suitable bearing means 1| on the outer surface of the frame 65, so that by manipulating the heads of the members 69, the position of the reticle within the tubular frame 65 may be accurately adjusted. The bearing means 1| may comprise a perforated strip or strips or perforated plates of suitable bearing material, such as copper, disposed beneath the heads of the adjusting screws and through the perforations of which the shanks of said screws extend. If desired, suitable bearing means may be interposed between the heads of the members 69 and the sleeve 65. The eyepiece focusing means 63 preferably comprises a lens carrying tube or frame 13 enclosed in a sleeve-like. element 15. The element 15 in` turn is supported in another sleeve-like member 11, the outer end of which is carried in the outer end of the Support frame 65, said sleeve 11 being formed with an annular portion 8| providing a seat fitting within the end of the support frame and an annular flange 19 overlying the end of the frame. The inner end of the sleeve 11 is received in a collar 83, which is adjustably supported within the frame 65 by means of adjusting screws 85, somewhat similar to the reticle adjusting fingers 69. The adjusting screws have heads extending outwardly of and bearing on the outer surfaces of the sleeve-like members 65, so that manipulating the heads of the members 85, the position of the inner end of Vthe sleeve 11 within the frame 65 may be adjusted. The sleeve 15 projects at its inner end beyond the inner end of the sleeve 11 and is threaded to receive a holding collar 81 by means of which relative axial movement of the sleeve 15 Within the sleeve 11 toward the right, viewing Figure 1, is prevented. The sleeve 15 outwardly of the collar 8|, carries an annular element 89, the outer surfaces of which are or may be knurled as at 9| to facilitate turning of the same, the element 89 being fast on the sleeve 15. One face of the annular element 89 is formed for snug seating engagement with the collar 8| and prevents relative axial movement of the sleeve 15 within the sleeve 11 toward the left, viewing Figure 1. The opposide side of the annular element 89 is formed to provide an extending lip 93 and an annular outwardly facing groove 95 within said lip, said groove 95 being Adisposed between the lip and the outer end of the sleeve 15, which extends outwardly to a point opposite said lip. 'lhe lens carrying tube 13 projects at one end opposite the reticle and at its other end from the outer end of the sleeve 15. The projecting end of the tube 13 is threaded, as at 91, to receive a cover 99 affording a peep hole |0| opposite the outer end of the lens carrying tube. The cover 99 has .an annular ange |03 extending within the lip 93 of the turnable element 89 and the annular space between the intertting lips 93 and |03 and the outer end of the sleeve 15 may be filled with resilient packing for the purpose of catching foreign matter, which may enter between the lips and thus prevent such foreign matter from gaining access to the telescope between the sleeve 15 and the lens carrying tube 13. The lens carrying tube 13 has a radially extending pin |65 fixed therein in position to extend into and through a diagonal slot |01 formed inthe sleeve 15 and a longitudinal slot |09 in the sleeve 11, so that by V'rotating the sleeve 15 by manipulating the collar 89, the relative movement of the slotted sleeve portions |01 and |09 will cause the pin |65 and consequently the sleeve 13, in which it is fixed, to move longitudinally of the sleeve 15, depending upon the direction of rotation imparted to the collar 89, so that by turning said collar in one direction or the other, the lenses in the element 13 may be focused accurately upon the cross hairs of the reticle 6|.

I have already explained that yielding material may be interposed in the opening between the intertting lips 93 and |03 and the sleeve 95 to prevent access of foreign matter to the outer end of the lens carrying element but I also provide a cover for enclosing and preventing access of foreign matter to the heads of the adjusting Vmembers 69 and 85. This cover comprises a preferably tubular sleeve threaded at one end as at I|3 to engage screw threads formed in the frame portion 61 adjacent and outwardly of the end of the telescope barrel in which said frame is mounted so that, when the cover is threaded on the `portion 61, its end will abut the end of the barrel of the telescope and form a continuation of the outer surface thereof. The opposite end of the tubular cover member is formed to snugly engage the outer surface of the adjusting collar 89 adjacent the collar 8| on which the same is seated, and resilient packing means ||5 may, if

desired, be interposed between the collars 8| and 89 and the end of they cover element Il I, whereby to prevent foreign matter from entering the eyepiece assembly between said collars.

It will be seen, therefore, that the cover f' adjustment of the reticle or of the axial position of the lens carrying element 13.

The cover and the surface of the adjusting collar 89 may be provided with a scale |1 and a cooperating gage mark ||9 for the purpose of giving visual indication of the internal adjustment of the shiftable sleeve 13.

It is thought that the invention and numerous of its attendant advantages will be understood from the foregoing description and it is obvious that numerous changes may be made in the form, construction and arrangement of the several parts of the illustrated apparatus without departing from the spirit or scope of my invention or sacrificing any of its attendant advantages,

for the purpose of illustrating the invention.

I claim:

1.A A telescope comprising a barrel including a tubular portion forming an eyepiece support, an

.70 the preferred form herein described being merely adjustable eyepiece unit on said support comprising eyepiece means including an eyepiece shiftable in said support, means for focusing said eyepiece comprising a turnable focusing element carried on said support and projecting at an end thereof, adjusting means exposed outwardly of said support for adjusting said eyepiece and focusing means laterally in said frame, cover means comprising a sleeve-like shell secured at one end on said barrel in position enclosing said exposed adjusting means, the other end of said sleevelike shell forming a running seal with the projecting portions of said focusing element to prevent access of foreign matter between the turnable focusing element and the said cover means.

2. A telescope comprising a barrel, means for mounting an adjustable eyepiece on said barrel comprising tubular means forming an extensio-n on said barrel, a sleeve movably mounted within said extension, means disposed outwardly of and carried by said extension and co-operatively associated with the sleeve Within the extension for adjusting laterally the axial position of said sleeve, cover means enclosing said extension and the outwardly exposed adjusting means thereon, focusing means comprising a lens-carrying member longitudinally movable in said sleeve, and actuating means for said focusing means carried by said sleeve and operatively associated with said sleeve and focusing means, said actuating means extending outwardly of said sleeve and cover to permit manipulation of the same, said sleeve, cover, and outwardly extending portions of the actuating means co-operating to prevent the entrance of foreign matter into the sleeve.

3. A telescope as set forth in claim 2, including co-operating means forming a scale, and a gauge mark formed on the adjacent exposed portions of the cover and outwardly extending portions of the actuating means.

4. A telescope comprising a barrel and a dustproof eyepiece unit on the end of the barrel, said unit comprising a tubular frame on and projecting outwardly of the end of the barrel, a support sleeve within the frame, said sleeve being supported at one end in the outer end of the frame, said sleeve having portions extending within the frame, adjusting means on the frame, accessible outwardly of the lateral walls thereof and operable to adjust the inwardly extending portions of said sleeve laterally within the frame, a turnable tube Within the sleeve and having a head extending outwardly of and bearing upon the outer end of the sleeve, outwardly of said frame, an eyepiece extending within said tube and outwardly of the outer end thereof, and a sleevelike dust excluding cover sealingly connected at one end on said frame inwardly of Asaid adjusting means and sealingly engaging said head at the other end of said cover, said sleeve enclosing said adjusting means and the joint between said head and said support sleeve.

5. A telescope as set forth in claim 4, wherein said cover, at one end, is in abutting relation with the end of the barrel and forms a continuation thereof.

6. A telescope as set forth in claim 4, wherein said cover is removably connected to the support sleeve and may be removed to reveal the adjusting means by sliding the same axially over the head.

7. 'A telescope as set forth in claim 4 wherein the head and co-operating end of the cover are provided one with a graduated scale and the other with an index.

8. A telescope comprising a barrel, adjustable means on said barrel at one end thereof, including an eyepiece, and means for focusing said eyepiece comprising a cylindrical focusing element supported and turnable in said barrel and having a portion projecting at an end of the barrel, said eyepiece extending within said cylindrical focusing element and having an exposed end protruding at the projecting end of said focusing element, an end cover on the protruding end of said eyepiece, a collar on the projecting end of said focusing element, said collar having a marginal flange and said end cover having a cylindrical portion fitting within and bearing upon the inner surfaces of said ange whereby to substantially prevent the entrance of foreign matter between the interfitting portions of said end cover and turning collar, the outer surfaces of said turning collar being manually operable to turn the focusing element for the purpose of focusing said eyepiece.

ADOLPI-I LANGSNER. 

